During the chaotic final weeks of the Vietnam War, the North Vietnamese Army closes in on Saigon as the panicked South Vietnamese people desperately attempt to escape. On the ground, American soldiers and diplomats confront a moral quandary: whether to obey White House orders to evacuate only U.S. citizens.

The year is 1974, and Barbara Dean (Judi Dench), a British assistant manager in a foreign bank in Saigon, begins a relationship with American Bob Chesneau (Frederic Forrest). She quickly realises that he works for the CIA and he knows that the fall of South Vietnam is very near.

Using obscure archival footage, animated illustrations and interviews, this film tells the story of the Vietnam War from the perspective of five Vietcong veterans: a soldier, an officer, an informant, a guerilla, a My Lai survivor, and the leader of the Long Hair army.